Worse yet, was you macbook anywhere around a PC?
Yeah, PCs have a tendency to rape macs.![]()
Looks to me like a ghostly image of a laughing chimpanzee's face. I clearly see its two eyes and head looking slightly towards the left. I would ask a specialist paranormal priest, like the famed Reverend MacPulpit, to investigate.
Ehh...couldn't it just be wear from the OP's finger over time?
Sometimes when you look at glass, usually cheap glass you can see those kind of swirls.